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Thanks Bill, much appreciated.

Hi, thanks for your response. I'm getting them from the Vertex Geographic search to fill in gaps in IW-mode SLC coverage. I assumed that as they are GRD processed they were delivered as sigma or gamma nought but perhaps I misunderstood.

Hi, I've downloaded Sentinel-1 Extra Wide swath mode RTC products as GRD-M processed data. They are 16-bit unsign integers (as I suppose you know). The scaling I cannot work out: data values range from ca. 76 to >2000. As a gamma nought product I assume i can convert to another scaling. Please tell ...